P. Gunanayagam, MD
Internal Medicine Physician · Antioch, CA
P. Gunanayagam, MD is an internal medicine physician with a practice address in Antioch, California, and NPI 1811075997, issued on Nov 2, 2006. Check the license (California A82707, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- P. Gunanayagam
- Credential
- MD
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- A82707 CA
Self-reported in NPPES; status is on the state search - Practice location
- 3400 Delta Fair Blvd, Antioch, CA 94509
- Phone
- (925) 779-5000
- Enumerated
- Nov 2, 2006
- Record last updated
- Dec 13, 2021 (not updated in 5 years: call before relying on the address or phone)
- Medicaid ID
- 00A827070 CA
- Medicare enrollment
- Enrolled (PECOS I20110331000772); accepts Medicare assignment
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 17,696 in California → Look up another NPI →
Also registered at 3400 Delta Fair Blvd
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify P. Gunanayagam in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A82707Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
2.2 times the Medicare Part D claims of the average internal medicine physician in 2024
7,081 Medicare Part D claims for 669 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. Brand-name drugs were 11% of claims. 631 claims were for opioids.
Most prescribed
- Atorvastatin Calcium559 claims
- Amlodipine Besylate370 claims
- Hydrocodone-Acetaminophen362 claims
- Gabapentin226 claims
- Atenolol206 claims
- Albuterol Sulfate Hfa203 claims
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
Bills Medicare through one group practice
- Permanente Medical Group IncAntioch, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
P. Gunanayagam among 17,696 internal medicine physician records in California
P. Gunanayagam, MD is one of 17,696 internal medicine physician records with a practice address in California. 79% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2006, is newer than 5% of them.
- NPI issued2006 · 5% of these records are older, 56% newer
- In a Medicare fileYes · 79% of these records are
- In the CMS Doctors and Clinicians fileYes · 63% of these records are
- Graduated1995 · median 2004 among the 11,065 with a school on file
- Record last updated2021 · 61% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207R00000X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
66 internal medicine physician records list a practice address in Antioch
They are 66 of the 2,184 NPPES records with a practice address in Antioch, and 17,696 internal medicine physician records in California.
All 17,696 in California → Every provider in Antioch → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Nazish Ali, M.D.Antioch, CA 945091932121498
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- Anita Cherian, MDAntioch, CA 945091306924402
- Carl Corrigan, MDAntioch, CA 945091285712349
- Waldo Ferrer, MDAntioch, CA 945091881772978
- Dileep Kumar, M.D.Antioch, CA 945091649290206
- Kishore Maskey, MDAntioch, CA 945091568540631
- Nahid Nazminia, MDAntioch, CA 945091831277326
Common questions
What is P. Gunanayagam, MD's NPI number?
P. Gunanayagam, MD's National Provider Identifier (NPI) is 1811075997, issued on Nov 2, 2006. An NPI identifies a provider in billing; it is not a license.
Where is P. Gunanayagam, MD located?
The NPPES record lists a practice address at 3400 Delta Fair Blvd, Antioch, CA, 94509. Phone: (925) 779-5000. Providers update this record themselves, so call before visiting.
How can I verify P. Gunanayagam, MD's license?
NPPES lists California license number A82707, as entered by the provider. Search the Medical Board of California at https://www.mbc.ca.gov/License-Verification/default.aspx. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does P. Gunanayagam, MD prescribe under Medicare Part D?
In 2024, P. Gunanayagam, MD had 7,081 Medicare Part D claims for 669 beneficiaries; the average among internal medicine physician prescribers was 3,176. Part D covers Medicare prescriptions only.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.